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8d5bef7fb8
and without a message number argument: the argument was called 'msg' but the code expected it to be called 'which'. In line with the other methods, I've renamed the argument to 'which', and adapted the doc string not to refer to 'msg'.
318 lines
7.3 KiB
Python
318 lines
7.3 KiB
Python
"""A POP3 client class.
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Based on the J. Myers POP3 draft, Jan. 96
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Author: David Ascher <david_ascher@brown.edu>
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[heavily stealing from nntplib.py]
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Updated: Piers Lauder <piers@cs.su.oz.au> [Jul '97]
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"""
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# Example (see the test function at the end of this file)
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TESTSERVER = "localhost"
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TESTACCOUNT = "test"
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TESTPASSWORD = "_passwd_"
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# Imports
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import regex, socket, string
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# Exception raised when an error or invalid response is received:
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class error_proto(Exception): pass
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# Standard Port
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POP3_PORT = 110
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# Line terminators (we always output CRLF, but accept any of CRLF, LFCR, LF)
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CR = '\r'
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LF = '\n'
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CRLF = CR+LF
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class POP3:
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"""This class supports both the minimal and optional command sets.
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Arguments can be strings or integers (where appropriate)
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(e.g.: retr(1) and retr('1') both work equally well.
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Minimal Command Set:
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USER name user(name)
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PASS string pass_(string)
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STAT stat()
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LIST [msg] list(msg = None)
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RETR msg retr(msg)
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DELE msg dele(msg)
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NOOP noop()
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RSET rset()
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QUIT quit()
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Optional Commands (some servers support these):
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RPOP name rpop(name)
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APOP name digest apop(name, digest)
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TOP msg n top(msg, n)
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UIDL [msg] uidl(msg = None)
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Raises one exception: 'error_proto'.
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Instantiate with:
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POP3(hostname, port=110)
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NB: the POP protocol locks the mailbox from user
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authorisation until QUIT, so be sure to get in, suck
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the messages, and quit, each time you access the
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mailbox.
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POP is a line-based protocol, which means large mail
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messages consume lots of python cycles reading them
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line-by-line.
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If it's available on your mail server, use IMAP4
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instead, it doesn't suffer from the two problems
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above.
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"""
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def __init__(self, host, port = POP3_PORT):
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self.host = host
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self.port = port
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.sock.connect(self.host, self.port)
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self.file = self.sock.makefile('rb')
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self._debugging = 0
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self.welcome = self._getresp()
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def _putline(self, line):
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#if self._debugging > 1: print '*put*', `line`
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self.sock.send('%s%s' % (line, CRLF))
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# Internal: send one command to the server (through _putline())
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def _putcmd(self, line):
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#if self._debugging: print '*cmd*', `line`
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self._putline(line)
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# Internal: return one line from the server, stripping CRLF.
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# This is where all the CPU time of this module is consumed.
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# Raise error_proto('-ERR EOF') if the connection is closed.
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def _getline(self):
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line = self.file.readline()
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#if self._debugging > 1: print '*get*', `line`
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if not line: raise error_proto('-ERR EOF')
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octets = len(line)
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# server can send any combination of CR & LF
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# however, 'readline()' returns lines ending in LF
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# so only possibilities are ...LF, ...CRLF, CR...LF
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if line[-2:] == CRLF:
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return line[:-2], octets
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if line[0] == CR:
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return line[1:-1], octets
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return line[:-1], octets
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# Internal: get a response from the server.
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# Raise 'error_proto' if the response doesn't start with '+'.
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def _getresp(self):
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resp, o = self._getline()
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#if self._debugging > 1: print '*resp*', `resp`
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c = resp[:1]
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if c != '+':
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raise error_proto(resp)
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return resp
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# Internal: get a response plus following text from the server.
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def _getlongresp(self):
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resp = self._getresp()
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list = []; octets = 0
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line, o = self._getline()
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while line != '.':
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octets = octets + o
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list.append(line)
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line, o = self._getline()
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return resp, list, octets
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# Internal: send a command and get the response
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def _shortcmd(self, line):
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self._putcmd(line)
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return self._getresp()
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# Internal: send a command and get the response plus following text
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def _longcmd(self, line):
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self._putcmd(line)
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return self._getlongresp()
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# These can be useful:
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def getwelcome(self):
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return self.welcome
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def set_debuglevel(self, level):
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self._debugging = level
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# Here are all the POP commands:
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def user(self, user):
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"""Send user name, return response
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(should indicate password required).
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"""
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return self._shortcmd('USER %s' % user)
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def pass_(self, pswd):
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"""Send password, return response
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(response includes message count, mailbox size).
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NB: mailbox is locked by server from here to 'quit()'
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"""
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return self._shortcmd('PASS %s' % pswd)
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def stat(self):
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"""Get mailbox status.
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Result is tuple of 2 ints (message count, mailbox size)
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"""
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retval = self._shortcmd('STAT')
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rets = string.split(retval)
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#if self._debugging: print '*stat*', `rets`
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numMessages = string.atoi(rets[1])
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sizeMessages = string.atoi(rets[2])
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return (numMessages, sizeMessages)
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def list(self, which=None):
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"""Request listing, return result.
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Result without a message number argument is in form
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['response', ['mesg_num octets', ...]].
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Result when a message number argument is given is a
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single response: the "scan listing" for that message.
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"""
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if which:
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return self._shortcmd('LIST %s' % which)
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return self._longcmd('LIST')
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def retr(self, which):
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"""Retrieve whole message number 'which'.
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Result is in form ['response', ['line', ...], octets].
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"""
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return self._longcmd('RETR %s' % which)
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def dele(self, which):
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"""Delete message number 'which'.
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Result is 'response'.
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"""
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return self._shortcmd('DELE %s' % which)
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def noop(self):
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"""Does nothing.
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One supposes the response indicates the server is alive.
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"""
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return self._shortcmd('NOOP')
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def rset(self):
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"""Not sure what this does."""
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return self._shortcmd('RSET')
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def quit(self):
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"""Signoff: commit changes on server, unlock mailbox, close connection."""
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try:
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resp = self._shortcmd('QUIT')
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except error_proto, val:
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resp = val
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self.file.close()
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self.sock.close()
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del self.file, self.sock
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return resp
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#__del__ = quit
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# optional commands:
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def rpop(self, user):
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"""Not sure what this does."""
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return self._shortcmd('RPOP %s' % user)
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timestamp = regex.compile('\+OK.*\(<[^>]+>\)')
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def apop(self, user, secret):
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"""Authorisation
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- only possible if server has supplied a timestamp in initial greeting.
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Args:
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user - mailbox user;
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secret - secret shared between client and server.
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NB: mailbox is locked by server from here to 'quit()'
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"""
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if self.timestamp.match(self.welcome) <= 0:
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raise error_proto('-ERR APOP not supported by server')
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import md5
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digest = md5.new(self.timestamp.group(1)+secret).digest()
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digest = string.join(map(lambda x:'%02x'%ord(x), digest), '')
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return self._shortcmd('APOP %s %s' % (user, digest))
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def top(self, which, howmuch):
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"""Retrieve message header of message number 'which'
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and first 'howmuch' lines of message body.
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Result is in form ['response', ['line', ...], octets].
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"""
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return self._longcmd('TOP %s %s' % (which, howmuch))
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def uidl(self, which=None):
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"""Return message digest (unique id) list.
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If 'which', result contains unique id for that message,
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otherwise result is list ['response', ['mesgnum uid', ...], octets]
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"""
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if which:
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return self._shortcmd('UIDL %s' % which)
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return self._longcmd('UIDL')
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if __name__ == "__main__":
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a = POP3(TESTSERVER)
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print a.getwelcome()
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a.user(TESTACCOUNT)
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a.pass_(TESTPASSWORD)
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a.list()
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(numMsgs, totalSize) = a.stat()
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for i in range(1, numMsgs + 1):
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(header, msg, octets) = a.retr(i)
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print "Message ", `i`, ':'
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for line in msg:
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print ' ' + line
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print '-----------------------'
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a.quit()
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